LG LMV1762SB, Service Manual

Page: 24 / 48

-24-
7. MICROWAVE LEAKAGE TEST
CAUTION
• Be sure to check microwave leakage prior to
servicing the oven if the oven is operating prior to
servicing.
• Service personnel should inform the
manufacturer, importer, or assembler of any
certified oven unit found to have a microwave
emission level in excess of 5 mW/cm2 and should
repair any unit found to have excessive emission
levels at no cost to the owner and should ascertain the
cause of the excessive leakage. The service
personnel should instruct the owner not to use the unit
until the oven has been brought into compliance.
• If the oven operates with the door open, service
personnel should;
- Tell the user not to operate the oven
- Contact the manufacturer and CDRH (Center for
Devices and Radiological Health)immediately.
NOTE: Address to CDRH
Office of Compliance (HFZ-312)
Center for Devices and Radiological Health
1390 Piccard Drive Rockville, Maryland 20850
• Service personnel should check all surface and
vent openings for microwave emission testing.
• Check for microwave energy leakage after every
servicing. The power density of the microwave
radiation leakage emitted by the microwave oven
should not exceed 1mW/cm2.sq. Always start
measuring of an unknown field to assure safety for
operating personnel from radiation leakage.
NOTE: The standard is 5mW/cm2.sq. while in the
customerʼs home.1mW/cm2.sq.stated here is
manufacturerʼs own voluntary standard for units in
customerʼs home.
EQUIPMENT-
• TESTER ((VOLTS-DC, AC, Ohmmeter)
• Microwave survey meter
- Holaday HI-1500
HI-1501
- Narda 8100
8200
• 600 cc non conductive material beaker (glass or
plastic), inside diameter:approx.8.5 cm (3
1
/
2
in.)
• Glass thermometer: 100 °C or 212 °F (1 deg scale)
MEASURING MICROWAVE ENERGY
LEAKAGE
• Pour 275±15cc of 20±5°C(68±9°F) water in a
beaker which is graduated to 600 cc, and place the
beaker in the oven.
• Set the energy leakage monitor to 2,450 MHz and
use it following the manufacturer's recommended
test procedure to assure correct result.
• When measuring the leakage, always use the
2-inch (5cm) spacer supplied with the probe.
• Operate the oven at its maximum output.
• Measure the microwave radiation using an
electromagnetic radiation monitor by holding the
probe perpendicular to the surface being
measured.
Move probe along shaded area.
Probe scanning speed
Less than 2.5 cm/sec. ( 1 in/sec)
Move probe along shaded area.
Probe scanning speed
Less than 2.5 cm/sec. ( 1 in/sec)